Method of making rings from tubing



Se t-17, 1929; G. E. NEUBERTH 1,728,897

I METHOD OF MAKING RINGS FROM TUBI NG Filed Oct. 31, 1927 Y ,.:L 1 BY V /0 A V v ATI'ORN INVENTOR Patented Sept. 17, 1929 UNITED STATES PATENT OFFICE GEORGE NEUBERTH, F NEWARK, NEW JERSEY, ASSIGNOR TO PIPE 8c TUBE BEND- ING CORPORATION OF AMERICA, OF NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY METHOD OF MAKING RINGS FROM TUBING Application filed October 31, 1927. Serial No. 229,888.

jected to a shearing action at the point where the shoulder is and the tube severed at this point. The severed ring can be compressed longitudinally to shape its ends if this step is deemed desirable. k

The invention will be more clearly understood from an inspection of the accompanying drawings, in which Fig. 1 is a section of a tube supported in a die, Fig. 2 is a similar view with the tube expanded for a portion of its length, Fig. 3 is a section showing the expanded tube out by a cutter, Fig. 4 is a view on a reduced scale of the ring after it is cut from the tube, and Figs. 5 and 6 are sections of a part of a modified form of die.

In the drawings the tube is shown at 10, the tube being of a relatively soft metal, and

\ in the making of tubes, the juncture of boiler tubes and boiler heads, copper is the metal employed. This is a requisite of such rings or bushings, the one end beingprevided with a flat face and with the other provided with a rounded face, the rounded portion terminating at the inside edge.- The tube is held in a.

die 11 into which it fits with a fairly close lit and it is preferably supported onthe inside by a mandrel 12. To prevent backward inotion of the tube under treatment I provide jaws 13 which are roughened on the inside face to hold the tube. On the holding die 11 is arranged the cutting die 1a which has an opening 15 which is larger than the tube to an extent to receive the end of the tube when expanded. The plunger 16 is .forced into the end of the tube 10 and ex ands it at 17111 Fig. 2, and the plunger 16 then retreats from the tube and thecutter 18 is forced into the tube and its cutting edge 19 co-operates with the edge 20 of the cutting die to shear longitudinally on the inside across the shoulder that joins the tube with its expanded portion. When this takes place the jaws 13 are re leased to' permit the tube to slide back a short distance out of the way and the nose 21 pushes the mandrel back so that the said mandrel forms no obstruction to the easy descent of the cutter. The shoulder 22, which is usually formed by a ring 23, presses on the top ring 24 which has been severed from the tube to form the flat face 25. The ring 23 can also be used as a stripper to slide the ring 24 from the cutter; and the cutter 18 is'usually indented slightly as at 26 so that when a cutter retreats it will carry the ring with it and the ring can then be stripped fromthe cutter by the stripper ring 23. The indentation 26 which-is circumferential is very slight, simply enough to hold the ring 24 on the cutter and the inner face of the ring 24 is straightened when the ring is stripped from the cutter.

The completed ring 24 is shown in Fig. 4, one face 25 being fiat and the other face 27 being curved, this being the natural curvature of the expanded end of the extension as will be evident from Fig. 2. After the ring has been made the mandrel 12 and the tube 10 are a ain advanced so as to present a part of the tu e for expanding as shown in Fig. 1, thus providing an intermittent longitudinal movement of the tube and an expanding and shearing of the expanded end when the movement ceases. This provides apractically continuous manufacture of rings from tubing without removing the tube from the machine that performs the successive operations.

In the case of a ring that has both of its edges provided with flat faces as shown at 28 rounded edge of the plunger, serves to permit an easy introduction of the plungervinto the end of the tube to force the gradual expansion of the part 17 from the top end of the tube to the bottom of the recess 15.

It will be evident that the parts shown are elementary and the successive operations can be done in any ordinary automatic machine that is now in commercial use for such successive operations, and power-driven machines can be used in the quantity production of rings by this method.

1. A method of making rings from a tube which method comprises supporting the tube on the inside and the outside and leaving the end free, then expanding said free end, and then shearing the tube longitudinally at the inner end of the expanded part.

2. A method of making rings from tubing which method comprises the intermittent longitudinal movement of the tube, expanding the tube at its end, and then shearing the tube longitudinally at the juncture of the tube and its expanded part during c-essations v of the movement.

3. A method of making rings from tubing which comprisesan intermittent longitudinal feeding of the tube and an expanding and longitudinal shearing of the expanded part during the intervals between said movements.

4. A method of making rings from tubing which method comprises supporting a tube on the inside, feeding the tube longitudinally to extend the end thereof, expanding said end and supporting said end on the outside,

and then shearing the tube longitudinally at the juncture of the expanded part and the tube, the expanding and shearing taking place when the tube movement ceases.

In testimony whereof I affix my signature.

GEORGE E; NEUBERTH. 

